Heap-based Buffer Overflow in Microsoft Word by Microsoft
CVE-2026-55130

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2019
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Vendor
CVE Published:
14 July 2026

What is CVE-2026-55130?

A heap-based buffer overflow in Microsoft Word can be exploited by unauthorized attackers to execute arbitrary code on vulnerable systems. This security flaw poses significant risks as it allows for the execution of malicious payloads, potentially compromising sensitive information and system integrity. Users are strongly advised to apply the latest patches provided by Microsoft to mitigate the risk associated with this vulnerability.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office LTSC 2021 32-bit Systems 16.0.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.